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L. M. SMITH & A. P, MORRILL.

HOISTING APPARATUS.

Patented Dec. 19, 1893.

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PATENT LORENZO M. SMITH AND ALLEN P. MORRILL, OF SHIPTON, CANADA.

HOISTING APPARATEJS.

SPECIIIGATION forming part of Letters Patent No..51l,255, dated December19, 1893. Applicationfiled July 11, 1393. seen No. 480,159. on model.)

To all whom it may concern:

Be it known that we, LORENZO M. SMITH and ALLEN P. MORRILL, subjects ofthe Queen of Great Britain, residing'at Shipton, in the county ofRichmond, Province of Quebec, Dominion of Canada, have invented certainnew and useful Improvements in Hoisting Apparatus, of which thefollowing is a descripters hereinafter described and, claimed, and isillustrated in the accompanying drawings, in Y which Figure 1 is aperspective view of our device applied to a hoisting derrick. Fig. 2 isa plan view of the boom swinging drum; and Figs. 3, i and 5 aremodifications.

In the drawings, A is the main portion of a derrick, B its boom, 0 thewinding drum of a hoisting engine, and c the rope from said drum to theboom by which the latter is raised, all of these elements being of wellknown construction. 'Hitherto'it has been customary to elevate. the boomto the required height and then by hand swing the same around by meansof ropes attached to its end. These two operations have been found toconsume a considerable amount of time and in order that the swinging maybe effectedsimnltaneously with the hoisting, we have provided a secondwinding drum receiving motion, preferably, from the hoisting drum, andsoattached to the boom as to produce the desired result. -This seconddrum is placed above the first drum!) and is constructed in threedivisions. Suitably journaled in the frame E are two shafts F and Fhaving only rotary movement, and a central shaft G so fixed in itsbearings as to be capable of both rotary and lateral movement. Upon thiscentral shaft is keyed a pulley g, while at either end it carries a geara, 1), moving laterally with the shaft and adapted to be thrown into andout of engagement with corresponding o or b as may be the case.

gears a, I), carried by the shafts F, F, re-

spectively. These shafts are each further provided with a winding spoolf, f, from which are ropes wand m, attached to the end or other suitablepart of the boom by means of which it is swung to the right or left asmay be desired.

It is obvious that the gears a, b, a, b, may be of any suitableconstruction, but we prefer to use friction pulleys as shown in thedrawings. Here the gears a, Z), are truncated cones, while the gears a,I), are blocks hollowed out upon one face to receive these cones.Preferably we make the hollow in the pulleys all), deeper than theheight of the cone portion of the pulleys a, b, so that when they areforced together the inclined surfaces of the cones are the only portionswhich touch the pulleys, thus allowing for wear.

Normally the central shaft Gr is in such a position that the gearscarried thereby are out of engagement with the gears on the shafts F andF, and in order to return this central shaft to such position after thegears have been forced into contact, we provide in blocks h fittin-gloosely over the shaft G and prevented from sliding toward the center bythe portions u of the frame, while the free side of the springs bearsagainst the pulley It is obvious, however, that many other forms ofspring may be employed, e. g., a spiral may be woundabout the shaft, oneend of this hearing against a fixed portion of the frame and the otheragainst the pulleys or other suitable projections upon the shaft, thisspring being so placed that movement of the shaft laterally one way orthe other will compress it.

Many constructions may be employed to shift the central shaft Gr. Inthat herein illustrated, two collars g, g are secured to the shaftbetween which fits the block mprovided with a groove for the passage ofthe shaft. This block is attached to a bar M at one portion pivoted to apart of the frame as 'n, and at its free end having secured to it a ropeor chain N, one part of which passes to the right over a suitable pulleyas o to a lever 0, while the other part of the rope or chain passes tothe present instance springs H fastened to ICO the left and then backover suitable pulleys as 0 to another lever O.

Brakes are applied to the shafts F and F and while these maybe of avariety of forms, we prefer that shown in the drawings, in which bands Psecured to the back of the frame pass over the pulleys a, b, and haveattached to their forward ends a rope or chain 10 fastened to a suitablelever V.

The drum C is provided with a pulley r and this through the band 3 andpulley g imparts motion to the shaft G.

The operation of our machine is as follows: The article to be hoisted,W, being fastened to the derrick rope, the drum 0 is caused to rotate,thus raising the weight and at the same time through the connectionsabove mentioned, rotating the central shaft G.. Suppose, then, it isdesired to swing the boom to the left. The lever O is depressed and heldin this position either by the operator or by suitable notches in theframe, and by this the pulley b is brought into contact with the pulleyb. This will cause the spool f to rotate and wind the rope 00, thusswinging the boom, the rope w unwinding freely as the shaft F is free torotate. WVhen the boom has been swung to the desired position, the leverO is released and the springs H. will carry the shaft G to its normalposition out of engage-- ment with the side shafts, while any tendencyof the boom to swing back from the place to which it has been brought isprevented by the application of the brake P. Should it be desired toswing the boom to the right, the spool f with the corresponding lever,pulleys, &c., would be employed.

This machine has been used very advantageously in mining, and while weprefer to construct the parts as herein described and illustrated, it ismanifest, as has been mentioned throughout the specification,that manymodifications may be made without departing in the least from the spiritof our invention. Some of the most important of these modifications areillustrated in Figs. 3, 4 and 5.

Referring first to the construction shown in Fig. 3, Q is a single shaftupon which is fixed the pulley g, and keyed upon the same so as to berotated with the shaft and at the same time allowed lateral movement,are the gears a, b. The winding spoolsfif, fitloosely over the shaft buthave no lateral movement, and each spool carries at its inner end one ofthe gears a, b. To the shifting lever M is attached a bar (1 whichcarries at each end a projectiontfitting in the slot 15 of the sleevesto, said sleeves forming a part of the gears a, I). From this it will beseen that the gears a, b are always in rotation, while by shifting thelever M either of the spools f, f may be thrown into use.

Of course, as shown in Fig. 4, clutch or other suitable forms of gearsmay be substituted for the cone pulleys and their corresponding blocks,or, as further shown in Fig.

4, the pulley maybe fixed upon the shaft and have extending from it theclutch sleeves o, o, the spools f, f fitting loosely upon the shaft andbeing provided with corresponding sleeves 0, '0, motion being impartedto one or the other of the spools by moving said spools laterally, forwhich purpose I may employ suitable shiftin g mechanism, 6. g., thatalready described.

Fig. 5 illustrates a construction in which the spools f and f litloosely upon the shaft Q and have between their inner ends a loosepulley G, said inner ends being formed into pulleys Z, Z. The loosepulley G corresponds to the pulley g in the construction illustrated inFig. 2, thus receiving the driving belt 3 from the hoisting drum 0.When, therefore, it is desired to swing the boom, the belt is merelyshifted from the loose pulley G to either pulley Z or Z, each of whichis rigidly connected to its respective spool f or f, thus causing thedesired spool to rotate and windthe rope attached to the boom.

Having thus described our invention, what we claim as new, and desire tosecure by Letters Patent, is-- 1. A winding mechanism for hoistingapparatus comprising a central shaft, a secondary independentspool-carrying shaft upon each side of said central shaft, and meanswhereby connection may be established between the central shaft andeither of said side shafts; substantially as described.

2. A winding drum for hoisting apparatus comprising a central shaft, asecondary spoolcarrying shaft upon each side of said central shaft,means whereby said central shaft may be thrown into connection witheither of said side shafts, projections upon said central shaft, a platefitting upon the central shaft and having no lateral movement withrespect to the frame of the drum, and springs fastened at one part tothe plate and at another bearing against the projections upon the shaft;substantially as described.

3. A hoisting apparatus comprising a derrick,a boom attached thereto, awinding drum having a pulley thereon, connections between said drum andthe boom for raising the same, a secondary drum frame, a central shaftin said frame, a pulley upon said central shaft, a belt connecting thepulley upon the winding drum with the pulley upon the central shaft, asecondary spool-carrying pulley upon each side of the central shaft, arope running from each of said spools to opposite sides of the boom, atruncated cone pulley upon each end of the central shaft, acorresponding hollow-faced pulley upon each secondary shaft, shouldersupon said central shaft, a block fitting between said shoulders, saidblock being attached to a lever pivoted at one end to the frame of thedrum, a rope attached to the other end of said lever, one end of therope passing to the right to a lever O and the other end passing to theleft, then to a lever O, a

brake upon each of the secondary shafts, a In testimony whereof we affixoursignatures plate fitting upon the central shaft, one near in presenceof two witnesses.

each end thereof, saidplates being prevented LORENZO M. SMITH. fromlateral movement with respect to the ALLEN P. MORRILL. 5 frame, andsprings between said plates and Witnesses:

the pulleys upon the central shaft; substan- A. A. MACLEAY,

tially as described. L t J OHN S. KIDDLE.

